/*
 * [The "BSD license"]
 *  Copyright (c) 2012 Terence Parr
 *  Copyright (c) 2012 Sam Harwell
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.codefinger.dao.antlr.v4.runtime;

import org.codefinger.dao.antlr.v4.runtime.atn.ATNConfigSet;

/**
 * Indicates that the parser could not decide which of two or more paths to take
 * based upon the remaining input. It tracks the starting token of the offending
 * input and also knows where the parser was in the various paths when the
 * error. Reported by reportNoViableAlternative()
 */
public class NoViableAltException extends RecognitionException {
	/**
	 * Which configurations did we try at input.index() that couldn't match
	 * input.LT(1)?
	 */

	private final ATNConfigSet	deadEndConfigs;

	/**
	 * The token object at the start index; the input stream might not be
	 * buffering tokens so get a reference to it. (At the time the error
	 * occurred, of course the stream needs to keep a buffer all of the tokens
	 * but later we might not have access to those.)
	 */

	private final Token			startToken;

	public NoViableAltException(Parser recognizer) { // LL(1) error
		this(recognizer, recognizer.getInputStream(), recognizer.getCurrentToken(), recognizer.getCurrentToken(), null, recognizer._ctx);
	}

	public NoViableAltException(Parser recognizer, TokenStream input, Token startToken, Token offendingToken, ATNConfigSet deadEndConfigs, ParserRuleContext ctx) {
		super(recognizer, input, ctx);
		this.deadEndConfigs = deadEndConfigs;
		this.startToken = startToken;
		this.setOffendingToken(offendingToken);
	}

	public Token getStartToken() {
		return startToken;
	}

	public ATNConfigSet getDeadEndConfigs() {
		return deadEndConfigs;
	}

}
